Archive
16th of March 2017
Biology
Q:

can u explain structure of all the phylum's ?

Brijesh Pujari - - Class IX

Thursday, March 16, 2017 at 18:10:PM

A:

Classification of Phylum Invertebrata:

PHYLUM

CHARACTERISTICS

EXAMPLES

Porifera

Simplest multicellular animals with a perforated body.

Sycon, bath

Coelenterata

Have a two-layered body wall.

Hydra, jellyfish

Platyhelminthes

Small, soft, flattened, unsegmented worms which do not have a body cavity or a coelom.

Liver fluke, tapeworm

Annelida

Possess a true body cavity called coelom.

Earthworm, leech

Nemathelminthes

The body is long, cylindrical and unsegmented without a body cavity.

Hookworm, Ascaris

Arthropoda

Have jointed limbs and an exoskeleton made of chitin.

Crayfish, crab

Mollusca

Have a soft, unsegmented body without appendages, with a hard, calcareous shell to protect the soft body.

Snail, slug

Echinodermata

The body may be spherical, cylindrical or star-shaped, hard and unsegmented. Possess a spiny exoskeleton.

Starfish, brittle star

Urochordata

Triploblastic animals with a coelom which show bilateral symmetry.

Balanoglossus, Amphioxus 

Classification of Phylum Vertebrata:

CLASS

CHARACTERISTICS

EXAMPLES

Pisces

Organisms belonging to Class Pisces are fish which are cold-blooded or poikilothermic animals.

Shark, dogfish

Amphibia

Cold-blooded vertebrate animals which have a body divisible into head and trunk. Neck is absent.

Frog, toad

Reptilia

The body is divisible into head, neck, abdomen and tail.

Lizard, snake

Aves

All birds belong to Class Aves which are warm blooded or homeothermic animals.

Pigeon, sparrow

Mammalia

Warm-blooded animals which give birth directly to their young ones.

Cat, dog

Thursday, March 16, 2017 at 18:15:PM